Sucker rod end fitting

Abstract

A connector to secure to the end of a cylindrical rod or cylindrical wire. The connector includes an elongated body having a receptacle with a cylindrical wall. A plurality of axially aligned tapered annuluses, coaxial with the receptacle, extend from the cylindrical wall into the body. Each annulus has a cross-section tangentially approaching the cylindrical wall at one end and an arcuate opposite end.

What is claimed is: 
     
       1. A connector to connect the end of a cylindrical rod, which connector comprises: an elongated body having a receptacle opening therein, the opening providing a receptacle wall; and   said receptacle wall being defined by a plurality of axially aligned tapered annuluses, each annulus having a cross-section defined by a pair of opposed ends, one end asymptotically approaching said receptacle wall in a convex curve as viewed from within said receptacle and the opposite end arcuately approaching said receptacle wall in a concave curve as viewed from within said receptacle.   
     
     
       2. A connector as set forth in claim 1 wherein an initially flowable adhesive may be inserted in said receptacle prior to insertion of said cylindrical rod so that said adhesive will fill said annuluses and harden or cure to form a solid. 
     
     
       3. A connector as set forth in claim 1 wherein said cylindrical rods are fiberglass, and wherein each end of each said rod may be attached to a connector and wherein adjoining connectors may be attached together. 
     
     
       4. A connector as set forth in claim 1 wherein each of said tapered annuluses differ in length and wherein said annuluses are arranged so that the annuluses decrease in length from the opening of said receptacle. 
     
     
       5. A connector to connect the end of a cylindrical rod or wire, which connector comprises: a tubular body having a cylindrical receptacle; and   a plurality of axially aligned tapered annuluses extending into said body and coaxial with said receptacle, each annulus having a cross-section radially tapered to a tangent with said cylindrical receptacle at one end of said annulus and radially arcuate about a center point positioned within said tubular body, and along an imaginary line perpendicular to said axis at the other end of said annulus.   
     
     
       6. A connector as set forth in claim 5 wherein said cylindrical rods are fiberglass, each end of each rod may be attached to a connector and wherein adjoining connectors may be attached. 
     
     
       7. A connector as set forth in claim 5 wherein an initially flowable adhesive may be inserted in said receptacle prior to insertion of cylindrical rod so that said adhesive will fill said annuluses and cure or harden to a solid.